Headstock feeding mechanism of tap measuring instrument

Abstract

The utility model discloses a headstock feeding mechanism of a screw tap measuring instrument, which comprises a base, and a headstock and a tailstock which are arranged on the base, the headstock and the tailstock are arranged at an interval, the headstock and the tailstock are provided with tips which are coaxially and oppositely arranged, the tailstock is fixed on the base, and the headstock is arranged on the base through a guide rail in a translation manner; the device further comprises a feeding driving assembly, the feeding driving assembly is in transmission fit with the positioning plate, a feeding compression spring extending in the direction of the headstock is fixed to the positioning plate, and the feeding driving assembly drives the positioning plate to move horizontally to drive the feeding compression spring to push the headstock to move horizontally. The positioning plate and the feeding pressure spring fixed on the positioning plate are driven by the feeding driving component to translate together, the feeding pressure spring is propped against the headstock and provides pressure for the headstock by utilizing the elasticity of the feeding pressure spring, so that the pressure is converted into pre-tightening force provided for the screw tap by the tip on the headstock, manual adjustment is not needed, and the working efficiency is improved. And the efficiency of screw tap measurement work is effectively improved.

Description

Technical Field

[0001] The utility model relates to the technical field of tap production and testing equipment, in particular to a head frame feeding mechanism of a tap measuring instrument. Background Art

[0002] Taps are used to process internal threads. During the design and production of taps, the various parameters and sizes of taps play an important role in affecting the cutting strength of taps. The tap measuring instrument is an instrument that measures the various dimensional parameters of taps through laser sensors. During measurement, the two ends of the tap are tightened using the tips installed on the headstock and tailstock of the tap measuring instrument, thereby fixing the tap for measurement. When testing and measuring taps of different specifications, it is necessary to adjust the position of the headstock to pre-tighten the tap. The traditional pre-tightening method is to first loosen the locking handle of the fixed headstock, then manually move the headstock to the appropriate position and then use the locking handle to fix the headstock. Not only is the operation cumbersome and the measurement efficiency low, but it also requires manual estimation of the pre-tightening force, which has large human errors. Too little pre-tightening force will cause the tap to move, and too much pre-tightening force will cause the tap to be stuck. Therefore, repeated adjustments are required to achieve a more appropriate pre-tightening state.

[0003] For example, the Chinese utility model patent with announcement number CN203824481U discloses an odd-slot tap diameter measuring instrument, including a base, an axial clamping mechanism capable of axially clamping the tap in the horizontal direction is installed on the base, a dial indicator position adjustment device capable of vertical position adjustment is also installed on the base, a dial indicator is installed on the dial indicator position adjustment device, the dial indicator includes a dial indicator head and a measuring rod located at the lower end of the dial indicator head, a flat probe is provided at the lower end of the measuring rod, and a plane perpendicular to the measuring rod is provided on the lower surface of the flat probe. The axial clamping mechanism of the utility model includes a left support installed on the left side of the base and a right support installed on the right side of the base and capable of sliding left and right, a left top is installed on the left support, a right top is installed on the right support, and the left top and the right top are coaxially arranged. The utility model drives the right top to move together by sliding the right support to apply preload force to the tap. The sliding of the right support can only be driven manually, and the size of the preload force still needs to be estimated and adjusted manually. Utility Model Content

[0004] The technical problem to be solved by the utility model is to provide a headstock feeding mechanism of a tap measuring instrument which is convenient for adjusting the pre-tightening force applied to the tap.

[0005] In order to solve the above technical problems, the technical solution adopted by the utility model is: the headstock feeding mechanism of the tap measuring instrument includes a base and a headstock and a tailstock installed on the base, the headstock and the tailstock are arranged at an interval, and the headstock and the tailstock are provided with coaxially oppositely arranged top ends, the tailstock is fixed on the base, and the headstock can be translated on the base through a guide rail; it also includes a feed drive assembly arranged on the base, the feed drive assembly is in transmission cooperation with the positioning plate, a feed compression spring extending toward the headstock direction is fixed on the positioning plate, and the feed drive assembly drives the feed compression spring to push the headstock to translate by driving the positioning plate to translate. The utility model drives the positioning plate and the feed compression spring fixed on the positioning plate to translate together through the feed drive assembly, and the feed compression spring pushes the head frame to move after contacting the head frame, so that the head frame and the top point on the tail frame cooperate to clamp the tap, and the feed compression spring rests on the head frame and uses its own elastic force to provide pressure for the head frame, which is converted into a pre-tightening force provided by the top point on the head frame for the tap, and the pre-tightening force is adjusted by the feed drive assembly to control the translation distance of the positioning plate, without the need for manual adjustment, which effectively improves the efficiency of the tap measuring work.

[0006] As an improvement of the above scheme: the feed drive assembly includes a reduction motor, a transmission gear and a rack; the reduction motor is fixed on the positioning plate, and the output end of the reduction motor is connected to the transmission gear; the rack is arranged in the same direction along the translation direction of the head frame and is fixedly connected to the base, and the transmission gear and the rack form a meshing fit; the positioning plate forms a meshing transmission with the rack through the transmission gear. The feed drive assembly of the utility model adopts a reduction motor to drive the transmission structure composed of a transmission gear and a rack to realize the transmission action, and the reduction motor drives the transmission gear to rotate, and the transmission gear realizes the translation of the positioning plate due to the meshing transmission with the rack; the reduction motor facilitates the accurate control of the translation distance of the positioning plate, which is equivalent to adjusting and controlling the thrust applied by the feed compression spring on the head frame and the preload force applied by the top tip on the tap.

[0007] As an improvement of the above scheme: it also includes a guide rail slider fixed at the bottom of the positioning plate, and the guide rail slider forms a sliding fit with the guide rail. In the utility model, the original guide rail of the tap measuring instrument is used to realize the translation of the positioning plate on the base, and the guide rail slider at the bottom of the positioning plate slides along the guide rail through the sliding fit with the guide rail, so that the translation path of the positioning plate can be limited, and the positioning plate will not be offset during the translation process.

[0008] As an improvement of the above solution, it also includes a limit block fixed on the base, the limit block is located on the moving path of the guide rail slider and forms a limit fit with the guide rail slider. In the utility model, the limit block is set to limit the limit moving distance of the positioning plate, and the limit block is used to block the guide rail slider to prevent the positioning plate from continuing to move forward after reaching the limit displacement distance.

[0009] As an improvement of the above scheme: it also includes a feed limit rod connected to the head frame, and the feed compression spring is sleeved on the feed limit rod and forms a clearance fit with the feed limit rod. The utility model sets a feed limit rod to limit the feed compression spring, and the feed limit rod passes through the feed compression spring to form a limit fit with the feed compression spring in the radial direction, thereby ensuring that the feed compression spring will not deflect during the process of applying pressure to the head frame, and providing a stable thrust for the head frame.

[0010] As an improvement of the above scheme: it also includes a support collar fixed on the positioning plate, the support collar is coaxially arranged with the feed compression spring, one end of the feed compression spring is fixed on the support collar; the end of the feed limit rod not connected to the head frame passes through the support collar and forms a clearance fit with the support collar. The utility model provides a clearance path for the feed limit rod during the compression process of the feed compression spring by arranging a support collar for the feed compression spring to pass through, thereby ensuring that the feed limit rod has sufficient length to provide a limiting effect for the feed compression spring.

[0011] As an improvement of the above scheme: it also includes a limit nut fixed on the end of the feed limit rod that is not connected to the head frame, and the two limit nuts are arranged at intervals in the length direction of the feed limit rod and respectively form a limit fit with the two end faces of the support collar. The utility model forms a limit fit on the translation path with the support collar by the limit nut arranged at the end of the feed limit rod, thereby preventing the feed limit rod from being separated from the support collar and adjusting the feed amount of the feed limit rod.

[0012] As an improvement of the above scheme: it also includes a displacement sensor, which is fixed on the positioning plate and is used to detect the distance between the headstock and the positioning plate. The utility model monitors the distance between the positioning plate and the headstock by setting a displacement sensor, and can obtain the displacement of the positioning plate according to the distance, and then obtain the deformation of the feed compression spring, calculate the load of the feed compression spring according to Hooke's law, and finally accurately obtain the preload force applied by the top of the headstock to the tap.

[0013] The beneficial effects of the utility model are as follows: the utility model drives the positioning plate and the feed compression spring fixed on the positioning plate to translate together through the feed drive assembly, and the feed compression spring pushes the head frame to move after contacting the head frame, so that the head frame and the top point on the tail frame cooperate to clamp the tap, and the feed compression spring rests on the head frame and uses its own elastic force to provide pressure for the head frame, which is converted into a pre-tightening force provided by the top point on the head frame for the tap, and the pre-tightening force is adjusted by controlling the translation distance of the positioning plate by the feed drive assembly, without manual adjustment, which effectively improves the efficiency of the tap measurement work; the utility model can realize the tightening and clamping of taps of different specifications, and the head frame is automatically tightened under the control of the feed drive assembly, and the utility model can calculate the pre-tightening force applied to the tap by monitoring the displacement of the positioning plate to obtain displacement data, which is convenient for accurate adjustment of the pre-tightening force. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 It is a structural front view of the utility model;

[0015] Figure 2 It is a top view of the structure of the utility model.

[0016] Marked in the figure: 100-base, 200-head frame, 300-guide rail, 410-positioning plate, 420-feed compression spring, 430-feed limit rod, 440-support ring, 450-limit nut, 460-limit through slot, 510-reduction motor, 520-transmission gear, 530-rack, 600-displacement sensor. DETAILED DESCRIPTION

[0017] In order to facilitate the understanding of the present invention, the present invention is further described below in conjunction with the accompanying drawings.

[0018] In the description of the present invention, it should be noted that the directions or positional relationships indicated by terms such as "front", "rear", "left", "right", "up", "down", and "inside" are based on the directions or positional relationships shown in the accompanying drawings and are only for the convenience of description. They do not indicate or imply that the device or component referred to must have a specific direction, be constructed and operated in a specific direction. Therefore, they cannot be understood as limitations on the present invention.

[0019] like Figure 1 and Figure 2As shown, the headstock feeding mechanism of the tap measuring instrument disclosed in the utility model comprises a base 100, a headstock 200, a tailstock, and a track 300; the base 100 is used as the basic component of the tap measuring instrument, and the headstock 200, the tailstock, and the track 300 are all installed on the base 100; the headstock 200 and the tailstock are used to fix the tap to be tested, and the headstock 200 and the tailstock are arranged on the base 100 at intervals, and a top is installed on each of the headstock 200 and the tailstock, and the two tops are coaxially arranged opposite to each other, and are respectively pressed against the two ends of the tap through the two tops. To facilitate the clamping of the tap, the distance between the headstock 200 and the tailstock is set to be adjustable, which is achieved by sliding cooperation between the track 300 and the headstock 200. The headstock 200 is set on the track 300 so that the headstock 200 can slide along the track 300, and the distance between the headstock 200 and the tailstock can be adjusted, thereby being able to meet the clamping requirements of taps of different specifications; after adjusting the position of the headstock 200, the headstock 200 can be locked to fix the headstock 200 on the base 100.

[0020] like Figure 1 and Figure 2 As shown, in order to improve the convenience of adjusting the headstock 200 and to facilitate the adjustment of the preload force applied to the clamped tap, the headstock feeding mechanism of the tap measuring instrument disclosed in the utility model is provided with a feed drive assembly and a feed compression spring 420 to achieve the above-mentioned effects. The feed drive assembly is in transmission cooperation with the positioning plate 410, and the positioning plate 410 can be driven to translate by the driving action of the feed drive assembly. The feed compression spring 420 is fixed on the positioning plate 410 and extends toward the headstock 200, that is, the feed drive assembly drives the positioning plate 410 to translate and drives the feed compression spring 420 to push the headstock 200 to translate. The translation direction of the positioning plate 410 is set to be consistent with the translation direction of the headstock 200, and the feed compression spring 420 moves with the positioning plate 410 and rests on the headstock 200. Further movement of the positioning plate 410 will cause the feed compression spring 420 to push the headstock 200, so that the headstock 200 is fed toward the tailstock, so that the top point on the headstock 200 and the top point on the tailstock are cooperated and pressed against the two ends of the tap, and the elastic force of the compressed feed compression spring 420 itself is pressed on the headstock 200 to provide a pre-tightening force for the tap, and the compression degree of the feed compression spring 420 is controlled by controlling the feeding distance of the positioning plate 410, thereby realizing the adjustment of the pre-tightening force borne by the tap.

[0021] Specifically, the feed drive assembly used in the present invention includes a reduction motor 510, a transmission gear 520 and a rack 530. Figure 1 and Figure 2As shown, the reduction motor 510 is fixed on the positioning plate 410, and the transmission gear 520 is coaxially fixed on the output shaft of the reduction motor 510 to form a transmission match. The positioning plate 410 forms a meshing transmission with the rack 530 through the transmission gear 520. The rack 530 is arranged along the translation direction of the head frame 200, and the rack 530 meshes with the transmission gear 520. The operation of the reduction motor 510 will drive the transmission gear 520 to rotate, and the rotation of the transmission gear 520 realizes the translation of the positioning plate 410; after the positioning plate 410 moves into place, the head frame 200 can be fixed on the base 100 through the self-locking function of the reduction motor 510. In order to achieve stable translation of the positioning plate 410, a guide rail slider is installed at the bottom of the positioning plate 410 in the utility model, and the guide rail slider is used to form a sliding fit with the guide rail 300 on the base 100, so that the guide rail slider can slide along the guide rail 300. During the translation process of the positioning plate 410, the guide rail slider can form a limiting fit with the guide rail 300 to avoid the positioning plate 410 from being tilted.

[0022] Furthermore, in the utility model, a limit stopper is installed on the base 100, and the limit stopper is located on the moving path of the guide rail slider and forms a limit fit with the guide rail slider. In the utility model, the limit stopper is provided to limit the limit moving distance of the positioning plate 410, and the limit stopper blocks the guide rail slider to prevent the positioning plate 410 from continuing to move forward after reaching the limit displacement distance.

[0023] Furthermore, in order to ensure that the feed compression spring 420 does not bend during the process of applying thrust to the headstock 200, and to provide a stable thrust to the headstock 200 and thus provide a stable pre-tightening force to the tap, a feed limit rod 430 is provided on the headstock 200. Figure 1 and Figure 2 As shown, one end of the feed limit rod 430 is connected to the head frame 200 and extends horizontally backward, and the outer diameter of the feed limit rod 430 is smaller than the inner diameter of the feed compression spring 420, so that the feed compression spring 420 can be sleeved on the feed limit rod 430, and the feed limit rod 430 can move axially in the feed compression spring 430. When the feed compression spring 420 is compressed, the feed limit rod 430 forms a support and limit for the feed compression spring 420, thereby preventing the feed compression spring 420 from bending or deflecting.

[0024] Furthermore, in order to make the feed limit rod 430 have a sufficient length to completely cover the feed compression spring 420, the length of the feed limit rod 430 is greater than the length of the feed compression spring 420 when it is in a relaxed state. However, if the length of the feed limit rod 430 is too long, it will affect the movement of the positioning plate 410. In order to solve the above problem, as Figure 1 and Figure 2As shown, in the present invention, a support collar 440 is fixed on the positioning plate 410, and the support collar 440 has a through hole with a diameter larger than the diameter of the feed limit rod 430. The support collar 440 is coaxially arranged with the feed compression spring 420 and the feed limit rod 430. One end of the feed compression spring 420 is fixed on the support collar 440, and the end of the feed limit rod 430 that is not connected to the head frame 200 passes through the support collar 440 and forms a clearance fit with the support collar 440. When the feed compression spring 420 is compressed, the end of the feed limit rod 430 can pass through the support collar 440, thereby providing a clearance path for the feed limit rod 430, so that the feed limit rod 430 and the positioning plate 410 form a relative movement without interfering with each other. The utility model also provides a limit nut 450, which is fixed on the end of the feed limit rod 430 that is not connected to the head frame 200. There are two limit nuts 450, and the two limit nuts 450 are arranged at intervals in the length direction of the feed limit rod 430, and the two limit nuts 450 respectively form a limit fit with the front and rear end faces of the support ring 440. In the process of the feed limit rod 430 moving forward or backward, the two limit nuts 450 can respectively abut against the front and rear end faces of the support ring 440 to prevent the feed limit rod 430 from continuing to move, so that the feed amount of the feed limit rod 430 can be adjusted, thereby controlling the distance between the head frame 200 and the positioning plate 410. The distance between the two limit nuts 450 can be equal to the thickness of the support ring 440, or can be greater than the thickness of the support ring 440; when the distance between the two limit nuts 450 is equal to the thickness of the support ring 440, the limit nuts 450 only provide a limiting function; when the distance between the two limit nuts 450 is greater than the thickness of the support ring 440, it can also provide a limiting path for the feeding action of the feed limit rod 430.

[0025] Based on the above structure, due to the setting of the limit nut 450, the relative movement distance between the feed limit rod 430 and the support ring 440 is limited. When the feed compression spring 420 is compressed to a certain extent, the support ring 440 cannot provide a clearance path for the feed limit rod 430. In view of the above problems, the utility model provides a limiting slot 460 on the head frame 200 to form a clearance fit with the feed limit rod 430, and the end of the feed limit rod 430 close to the head frame 200 passes through the limiting slot 460, and the end head size of the feed limit rod 430 is larger than the slot width size of the limiting slot 460 so that the end head of the feed limit rod 430 can be against the end face of the limiting slot 460 to form a limiting fit, and the slot width size of the limiting slot 460 is smaller than the inner diameter size of the feed compression spring 420, and the rod body part of the feed limit rod 430 forms a clearance fit with the limiting slot 460 so that the limiting slot 460 can provide a clearance path for the feeding action of the feed limit rod 430. When the feed compression spring 450 recovers its deformation and drives the positioning plate 410 to retreat, the head frame 200 can be pulled backward through the limiting cooperation between the end of the feed limiting rod 430 and the limiting through slot 460.

[0026] In order to accurately calculate the applied preload, Figure 1 and Figure 2 As shown, the utility model installs a displacement sensor 600 on the positioning plate 410, and the displacement sensor 600 is used to detect the distance between the head frame 200 and the positioning plate 410, so as to monitor the displacement of the positioning plate 410, and then obtain the preload force applied by the feed compression spring 420 through the deformation of the feed compression spring 420 and the load of the feed compression spring 420 through Hooke's law, so as to obtain an accurate preload force value.

Claims

1. A headstock feeding mechanism of a tap measuring instrument, comprising a base (100) and a headstock (200) and a tailstock mounted on the base (100), wherein the headstock (200) and the tailstock are spaced apart from each other, and the headstock (200) and the tailstock are provided with coaxially oppositely arranged top ends, the tailstock is fixed on the base (100), and the headstock (200) is movably arranged on the base (100) via a guide rail (300), characterized in that: The invention also includes a feed drive assembly arranged on the base (100), the feed drive assembly cooperates with the positioning plate (410) in transmission, a feed compression spring (420) extending in the direction of the head frame (200) is fixed on the positioning plate (410), and the feed drive assembly drives the feed compression spring (420) to push the head frame (200) to translate by driving the positioning plate (410) to translate.

2. The headstock feeding mechanism of the tap measuring instrument according to claim 1, characterized in that: The feed drive assembly comprises a reduction motor (510), a transmission gear (520) and a rack (530); the reduction motor (510) is fixed on the positioning plate (410), and the output end of the reduction motor (510) is transmission-connected with the transmission gear (520); the rack (530) is arranged in the same direction as the translation direction of the head frame (200) and is fixedly connected to the base (100), and the transmission gear (520) and the rack (530) form a meshing fit; the positioning plate (410) forms a meshing transmission with the rack (530) through the transmission gear (520).

3. The headstock feeding mechanism of the tap measuring instrument according to claim 2, characterized in that: It also includes a guide rail slider fixed to the bottom of the positioning plate (410), and the guide rail slider forms a sliding fit with the guide rail (300).

4. The headstock feeding mechanism of the tap measuring instrument according to claim 3, characterized in that: It also includes a limit stopper fixed on the base (100), the limit stopper is located on the moving path of the guide rail slider and forms a limit fit with the guide rail slider.

5. The headstock feeding mechanism of the tap measuring instrument according to claim 1, characterized in that: It also includes a feed limit rod (430) connected to the head frame (200), and the feed compression spring (420) is sleeved on the feed limit rod (430) and forms a clearance fit with the feed limit rod (430).

6. The headstock feeding mechanism of the tap measuring instrument according to claim 5, characterized in that: It also includes a support collar (440) fixed on the positioning plate (410), wherein the support collar (440) is coaxially arranged with the feed compression spring (420), and one end of the feed compression spring (420) is fixed on the support collar (440); the end of the feed limit rod (430) that is not connected to the head frame (200) passes through the support collar (440) and forms a clearance fit with the support collar (440).

7. The headstock feeding mechanism of the tap measuring instrument according to claim 6, characterized in that: It also includes a limiting nut (450) fixed on the end of the feed limiting rod (430) that is not connected to the head frame (200), and two limiting nuts (450) are arranged at intervals in the length direction of the feed limiting rod (430) and respectively form a limiting fit with the two end surfaces of the support ring (440).

8. The headstock feeding mechanism of the tap measuring instrument according to claim 1, characterized in that: It also includes a displacement sensor (600), which is fixed on the positioning plate (410) and is used to detect the distance between the head frame (200) and the positioning plate (410).

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